Gear-grinding machine



- G. E. STEVENSON ET AL GEAR GRNDING lvzAcHINE, Filed May .17, 1920 7 sheets-sheet s May 6', 19241 G. E. sTEvENfsoN ET AL GEAR GRINDING MACHINE Filed May 17. 1920 '7 Sheets-Sheet 4 May 6 ,1 1924@ Lgzl G. E. STEVENSON ET AL.

GEAR GRINDING MACHINE Filed May 17 1920 7 Sheets-Sheet 5 George E.5+even son l George l?. Sevenon,

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May 6 1924. lgggggn G. 1E. sTEvENsoN ET AL y ,y

GEAR GRINDING MACHINE Filed May 1v. 1920*- v sheets-sheet ej 1,492,611 G. E. STEVENSON ET Al.

GEA'R GRINDING MACHINE Filed May 17. 1926 7 Sheets-Sheet '7 5mm/woz George E.. Sievenson George Fl. Sevensorl.,

Patented May 6, 1924.

UNITED STATES PATENT omer..

GEORGE EVERETT STEV'ENSON AND GEORGE R STEVENSON, OF INDIANAPOLIS,

` INDIANA. Y

GEAR-@BINDING- MACHINE.

Application led May 17,

To all 'whom z* may concern:

Be it known that we, GEORGE E. STEVEN- soN and Gronau R. S'ruvENsoN, citizens of the United States, residing at Indiana olis,

in the county of Marion and State o Indiana, have invented a new and useful Gear-Grinding Machine, of which the following is a specification.

The object of our invention is to produce a compact and efficient machine for simul- 15. ofk our invention using grinding. Wheels hav- Aing a grinding surface corresponding to the valley between two teeth; Fig. 2 a plan of .the machine shown in Fig. 1; Fig. '3 a side elevation at right angles to the plane of Fig. -1; Fig.'4 a section on line 4-4 of Fig. 1; Fig. 5 a fragmentary section of the ram and adjacent parts; Fig. 6 a view similar to Fig. 1 showing a modification utilizing cylindrical grinding wheels; Fig. 7 a plan of Fig. 6; Fig. 8 an elevation in a plane at right angles to the plane of Fig. 6; and Fig. 9 a diagram showing the manner of developing the guide cams used in the form of machine shown in Figs. 6 to 9.

in the drawings, 10 indicates a suit-able base provided with a vertical semi-cylindrcal bearing 1l, complemented by the semi-cylindrical cap 12. Journaled in the lower end of bearing 11--12 is a tubular driver 13, held aga-instaxial movement by collar 14 and carrying a Worm-wheel 15. At its upper end, driver 13 is semi-annular (as indicated at 13') and mates with a similar semi-annular portion 16 at the lower 5" end of a ram 16 mounted for rotation and axial reciprocation in the upper end of bearing 11 and projecting above the upper end thereof.

Ram 16 is provided with a central tubular 1920. Serial No. e 381,802.

spindle 17 provided, at its upper end, with a tapered socket 18 adapted to receive an arbor 19 upon which the gear, gear blank, or other article is to beheld for manipulation. "Extending through spindle 17, and into socket 18, is' an ejector rod 20, adapted to engage, and eject, the arbor 19, and the lower end of this rod rests upon a foot lever 21 by which' it may be operated to eject arbor 19. v

Mounted upon base 10 is a. cylindrical basin 25 havinga central tubular study 26 coaxial with bearing 11. lJournaled upon stud 26 is a, crown gear 27, supported on ball bearings 28 and carrying a spur gear 29.

Formed in the edge of basin 25 are several (six in the present instance) half-bearings 30 which extend radially of the axis of bearing 11 and are complemented by similar half-bearings carrie by a. basin 31 fwhich, in its major portion, is nested in gear v27 and is provided with an overhanging edge resting upon the upper edge of basin 25. Basin- 31 carries a series of radially arranged bearings 32 which aline with bearings 30, and in each pair of bearings 30-32, we journal a shaft 33, one being outwardly extended to receive a driving i pulley 34. Each shaft 33 carries a. pinion 35 meshing with gear 27, and also 'carries, at its inner end, a flexible extension 36, connected, at its inner end, with a shaft 37 journaled in a carriage 38 slidably mounted in a block 39. Each block 39 is held in place by bolts 40 which lie in arc grooves 41 formed in the bottom of basin 31, the arrangement being such that each block 39 may be angularly adjusted around the axis of arbor 18 and each carriage 38 may be reciprocated along lines which will be parallel with radii from the axis of said arbor.

VMeshing with gear 29 is a gear 45 carried by a vertical shaft 46 provided with a worm 47 meshing witha worm Wheel 48 which is journaled on a shaft 48 carrying a pinion 49 meshing with a gear 50, which, in turn, meshes with a, gear 51 carried by a crank-shaft 52 having a wrist-pin 53. Journaled on pin 53 is a pit-man 54 which is also journaled on a pin 55 vertically adjustable in a slot 56 in ram 16 and projecting through a slot 57 in bearing 11.

Formed in basin 31- is an annular pocket covered by an L-shaped ring 61. In pocket 60 is journaled a r1 e'ar 62 which is engaged by a gear '63 carrie by a tubulal. shaft 64 journaled in a bearing 65 carried by basin 31 and carrying a bevel gear 66 which meshes with a gear 67 carried by a shaft 68 having a gear 69 which Vmeshes with a gear 70 carried by a shaft 71 carrying a gear 72 meshing with a gear 73 on Shaft 48. A clutch 74, controlled by a shifting lever 75, controls connection' between gear 48 and shaft 48.

Thus far the mechanism in the two forms shown in the drawings are the same.

In the form of machines shown in Figs. 1-5, inclusive, each shaft 37 is provided with a grinding element 80, the periphery of which, in the present instance, is formedy with a cross-section which exactly correspondsto the shape of the space desired between two adjacent teeth of a gear which is to be supported upon the arbor 19.

In order to gradually move the grinding elements inwardly to their final position, each carriage 38 is provided with an outwardly extending pin 81, longitudinally adjustable on the carriage by means of a nut 82 and each of these pins is projected into the channel 60 and engaged by a cam ring 83 attached to gearV 62 (Fig. 1), said cam ring having a lseries of cam notches 83', one Jfor each pin 8l.

As previously stated, the gear 62 is moved by means of the train 63-66-67- 68-69--70.

Gear 70 is a splined on shaft 71 which is supported in bearings so as to be axially shiftable as well as rotatable.

J ournaled on shaft 71 is the gear 72 having a clutchv member 87 capable of mating with a clutch member 88, on shaft 71, the arrangement bein such that with the parts in the positions s own in Fig. 1, shaft 71 will be clutched to and rotate with gear 72, but when withdrawn slightly to the left, the shaft 71 will be free from gear 72 and may then be rotated by hand so as to rotate gear 70 and the driving train from that point to gear 62. A

Meshing with gear 72 is a gear 73 carried by shaft 48 so that when clutch 88 is in engagement with clutch 87, gear 62 and cam 83 will be driven through the medium of ear 48.

haft 46 carries a bevel gear 90 at its lower end and this gear meshes with a bevel pinion 91 carried by a friction disk 92 journaled upon shaft 93.' Shaft 93 carries a worm 94 which meshes with the .worm gear 15. Splined upon shaft 93 and mating with the friction disk 92 is a friction disk 95 which is held in engagement with disk 92 by means of a weighted lever 96. Secured to shaft 93 is a gearr97 which meshes with a larger gear 98.

afname Gear 98 carries a small gear 99 which meshes with a larger gear 100, and secured to gear 100, is a stop cam 101. Cam 1 01 is provided with a shoulder 102 under which the stop arm 103 is normally held by .the weighted lever 104, the arrangement being such that rotation of shaft 93 is normally prevented by the stop arm 103, although there is a constant tendency toward such rotation, due to the action of disk 92 on disk 95. Engaging arm 103 is a one-way pawl 105 carried by a lever 106. One arm of lever 106 is connected by a toggle link- 107 with a vertically movable plunger 108 connected to one arm of a bell crank lever 109, the other arm being connected to a plunger 110 projectedthrough the shaft which carries gears 66 and 63 and into position to be engaged by one of carriages 38 whenever said carriage is permitted to move outwardly toits extreme by having cam 83 moved to a position to bring the deepest part ot one of the cam notches 83 opposite its finger 81. 1

Each carriage 38 is normally urged outwardly by a spring 38', the arrangement being such that. Whenever cam ring 83 has been rotated enough to bring the deep part of one of the notches 83 opposite the fingers 81 of carriages 38, one of said carriages will thereupon be moved out into engagement with plunger 110 and said plunger acting through lever 109, plunger 108, link 107 and a lever 106, will move stop arm 103 out of engagement with the cam shoulder 102, the pawl 105 during that movement swinging freely from arm 103 so that said arm may be immediately moved back into engagement v with the cam 101.

As soon as cam 101 is released by the outward movement of arm 103, the train of gears connected with cam 101 is set in motion, due to the action of disks 92-95, and a complete rotation of cam 101 is insured, said cam coming to a stop at the end of said rotation against arm 103. Rotation of the train of gears connected to cam 101 permits rotation of shaft 93 so as to rotate member 13 and thus rotate the ram an amount equal to the distance between the two teeth of the gear which is being acted upon, the train of gears connected to cam 101 being so proportioned as to permit this desired movement.

In the form shown in Figs. 6-9, inclu sive, the inding element is provided with a cylindrlcal periphery so that during a major portion of its operation, it acts at one edge only upon a comparatively small portion of the tooth and consequently means must be provided to rotate the gear carrying arbor during the radial movement of the grinding element. In order to accomplish this result, we provide a cam ring 120 instead of the cam ring 83 and this cam memoir ring is provided with a series of cam notches of peculiar form, to be hereafter explained.

It is apparent that in this form of cam ring 120 must at all times bear a definite angular relationship to the gear-carrylng arbor. Consequently, shaft 68 is provided with an extension 121 which carries a gear 122 at its lower end. This gear meshes with a gear 123 carried by a gear 124 meshing with a gear 125 which meshes with a gear 126 carried by a shaft 127 which shaft carries a worm 128 meshing with worm wheel 15.

In this form oi the machine, we provide a gear 130 similar to gear 45, and carried by shaft 131 carrying a worm '132, meshing with a gear 133 carrying two gears 134 and 135. Gear 135 meshes with gear 136 which meshes with a gear 137 carried by the crank shaft 52. Gear 134 meshes with gear 140 which meshes with gear 141 which takes the place of gear 72 in the other form and is connected to gear 70, the arrangement and proportions of the gears being such that, if

where six grinding elements are provided, the cam ring 120 will be moved through of a rotation, while the gear-carrying arbor is rotated through an angular distance equal to the distance between the center lines of two adjacent teeth of the gear carried by the arbor.

We claim as our invention:

1. The combination, with a suitable frame and a work-supporting spindle journaled therein, of a support through which the spindle is projected, a tool-driving gear journaled on said support, a stationary carrier surmounting said gear, a support for a tool carriage mounted on said carrier and alngularly adjustable thereon, a tool carriage slidably mounted on said last-mentioned support, a rotatable tool journaled on said carriage, driving connections between said tool and the tool-driving gear, a cam rotatably mounted on the stationary carrier, means carried by the tool carriage and engaging the cam, and means for rotating said cam.

2. The combination, with a suitable frame and a worlesupporting spindle journaled therein. of a support through which the spindle is projected, a tool-driving gearjournaled on said support` a stationary carrier sui-mounting said gear, a. support for a tool carriage mounted Von said carrier, a tool carriage slidably mounted on said last-mention support, a rotatable tool journaled on said carriage, driving connections between said tool and the tool-driving gear, a cam rotatably mounted on the stationary carrier, means carried by the tool-carriage and engaging the cam, and means for rotating said cam.

3. The combination, with a suitable frame and a work-supporting spindle journaled therein, of a support through which theA spindle is projected, a tool-driving gear journaled on said support, a stationary carrier 'surmounting said gear, a support for a tool spindle is projected, a tool-driving gear journaled on said support, a stationary carrier surmounting said gear, a support for a tool carriage mounted on said carrier, a tool carriage slldably mounted on said last-men tioned support, a rotatable tool journaled on said carriage, driving connections between said tool and the tool-driving gear, and means for shifting the tool carriage on its support.

5. rThe combination, with a suitable frame and a work-supporting spindle journaled therein, of a support .through which the spmdle is projected, a tool-driving gear journaled on said support, a stationary carrier surmounting said gear, a support for a tool carriage mounted on said carrier and angularly adjustable thereon, a tool carriage slidably mounted on said last-mentioned support, a rotatable tool journaled on said carriage, driving connections between said tool and the tool-driving gear, a cam rotatably mounted on the stationary carrier, means carried by the tool carriage and engaging the cam, means for rotating said cam, means for axially reciprocating the work-spindle, and means for rotating the work-spindle inv synchronism with the cam movement.

6. The combination, with a suitable frame and a Work-supporting spindle journaled therein, of a sup ort through which the spindle is pro'ecte a tool-driving gear journaled on sai su port, a stationarv carrier surmounting sai gear, a support for a tool carriage mounted on said carrier, a tool carriage slidably mounted on said last-mentioned support, a rotatable tool journaled von said carriage, driving connections between said tool and the tool-driving gear, a cam rotatablymounted on the stationary carrier, means carried by the tool-carriage and engaging the cam, means for rotating said cam, means for axially reciprocating the work-spindle, and means for rotating the work-spindle in synchronism with the cam movement.

' 7. The combination, with a suitable frame and a work-supporting spindle journaled therein, of a support through which the spindle is projected, a tool-driving gear journaled Aoii said su port, a stationair? carrier surmounting sai gear, a support or a tool carriage mounted on said carrier and augularly adjustable thereon, a tool carriage slidably mounted on said last-mentioned support, a rotatable tool journaled on said carriage, driving connections between said tool and the tool-driving gear, a cam rotatably mounted on thestationary carrier, means carried by the tool carriage and engaging the cam, means Ior` rotating said cam, and means for axially reciprocating the workspindle.

8. The combination, with a suitable frame and a work-supporting spindle journaled therein, of a sup ort through which the spindle is projecte a tool-driving gear journaled on said support, a stationar carrier surmouiiting said gear, a support or a tool carriage mounted on said carrier a tool carriage slidably mounted on said last-mentioned support, a rotatable tool journaled on said carriage, driving connections between said tool and the tool-driving gear, a cam a rotatably mounted on the stationary carrier,

means carried ly the tool-carriage and engaging the cam, means for rotating said cam, and means for axially reciprocating the Work-spindle.

9. The combination, with a suitable frame' and a work-supporting spindle journaled therein, of a support through which the spindle is projected, a tool-driving gear journaled on said Asupport,.a stationar carrier surmounting said gear, a support or a tool carriage mounted on said carrier and angu-A larly 'adjustable thereon, a tool carriage slidably mounted on said last-mentioned support, a rotatable tool journaled on said carriage, driving connections between said tool and the tool-driving gear, a cam rotatably mounted on the stationary carrier, means carried by the tool carriage and engaging the cam, means for rotating said cam, means for axially reciprocating the work-spindle, and means for rotating the work-spindle.

10. The combination, with a suitable frame and a work-supporting spindle journaled therein, of a support through which the spindle is projected, a tool-driving gear journaled on said support, a stationary carrier surmounting said gear, .a support for a tool carriage mounted on said carrier, a tool carriage slidably mounted on' said last-mentioned support, a rotatable tool journaled on said carria e, driving connections between said too and the tool-driving gear, a cam rotatably mounted on the stationary carrier, vmeans carried by the tool-carriage and,` engaging the cam, means for rotating said cam, means for axially reciprocating the work-spindle, and means for rotating the work-spindle.

11. The combination of a suitable frame, a work-supporting spindle carrier journaled neeaeii therein, means for axially reciprocating said spindle carrier, a driving member journaled,

in the frame c o-axially with the spindle carrier and having a rotatably-interlocking, axially-shiftable connection with the spindlecarrier, and means for rotating said driving member.

12. The combination of a suitable frame, a worksupporting spindle carrier journaled therein, means for axially reciprocating said spindle carrier, a driving member journaled in the support coaxially with thev spindle carrier and having a rotatably-interlocking, axially-shiftable connection with the spindle-carrier, means for rotating said driving member, said means comprising a pair of frictional driving elements, a stop mechanism normall preventing rotation of said driving mem er, and means for intermittently withdrawing said stop member.

13. The combination, with a suitable frame and a work-supporting spindle journaled therein, of a support through which the spindle is projected, a tool-driving gear journaled on said support, a tool arranged to act upon Work carried by the spindle and driven by said gear, means for axially reciprocating the work spindle, a gear carried by the tool-driving gear, and drivin connections between said last-mentione gear and the means for reciprocating the spindle.

14. The combination, with a suitable frame and a work-supporting spindle journaled therein, of a support through which the spindle is projected, a tool-driving gear jour naled on said suport, a tool arranged to act upon work carri by the spindle and driven by said gear, means for axially reciprocating'the work spindle, means for aiigularly advancing the spindle step by step, a ear carried by the tool-driving gear, and riving connections between said last-mentioned gear and the means for reciprocating and advancing the spindle. v

15. The combination with a suitable frame, and a work-supporting spindle journaled therein, of a support through which the spindle is projected, a plurality of circumferentially-spaced tool carriages mounted on said support and movable toward and from the spindle, tool-supports carried by said carriages, a main driving gear journaled on said support, driving connections between said last-mentioned gear and the several tool-supports,.and means for axially iecip' rocating the s indle.

416. The com ination with a suitable frame and a work-supporting spindle journaled therein, of a sup ort through which the spindle is projecte a plurality of circumferentially-spaced tool carriages mounted on said sup ort and movable toward and from the spin le, ltool-supports carried by said carriages, a main driving gear journaled on said support, and driving connections between said last-mentioned gear and the several tool supports.

17. The combination with a, suitable frame and a work-supporting spindle iournaled therein, of a too carriage movab e toward and from the s indle, means for axially reciprocatin sai spindle, means for rotating the s in e, said means comprising a frics indle, said means com rising a frictionv riving train, a stop mem r normally preventin rotation of the spindle, and means controed by the movemento the tool carriage for intermittently withdrawing said stop member.

19. The combination with a suitable frame and a work-supporting spindlebournaledy therein, of a too carriage mova e toward and from the s indle, means for axially reeiprccatin sai spindle, means for rotating the spin e, said means comprising a friction driving train, a stop member normally preventing rotation of the spindle, and means for intermittently withdrawing said stop member.

20. The combination with a suitable frame and a work-supporting spindle journaled therein, of a tool carriage movable toward and from the spindle, means for rotating the spindle, said means comprising a friction driving train, a stop member normally preventing rotation of the spindle, and means for intermittently withdrawing said stop member. 4

21. The'combination with a suitable frame and a work-supporting spindle journaled therein, of a plurality of circumferentiallyspaced tool carriers, each having a tool-support and grouped around said spindle and movable toward and from the same, a driv .ing gear, connections between said gear and the several tool-supports, a cam formed to act upon the several tool carriers and shift the same relative to the spindle, and driving connections between said gear and cam. In witness whereof, we have hereunto set our hands at Indianapolis, indiana, this third day of April, A. D. one thousand nine hundred and twenty.

GEORGE EV'ERETT STEVENSON. GEORGE R. STEVENSON. 

